<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <!-- action  向服务器发送请求的URL -->
   <form action="http://localhost:8080/" method="get">
       <p>用户名: <input type="text" name="username"></p>
       <p>密码: <input type="password" name="pwd"></p>
       <p><input type="submit"></p>
   </form>
</body>
</html>